Overview

Did you know that a harmless boil can be an alarming sign of methicillin-resistant Staphylococcus aureus (MRSA) infection? Boils are hard, swollen, painful lumps that form beneath the skin. They usually start as skin hair follicle infections and gradually grow larger as pus accumulates, indicating a serious bacterial infection.¹

Staphylococcus aureus, a normal bacteria in our skin, nose, and mouth, is the leading cause of skin infections. S. aureus, specifically MRSA can become opportunistic in individuals with weaker immune systems, such as diabetics with poor wound healing, cancer patients with impaired lymphatic and blood systems, and HIV patients with compromised immunity.² Therefore, having thorough checkups regularly is crucial. 

As Sir Henry Lindlahr quotes, “Bacteria and parasites cannot cause disease processes unless they find their own peculiar morbid soil in which to grow and multiply”. On that note, let's explore how a simple boil may progress into da evastating MRSA infection.

Figure1: (A)The image here depicts the layers of human skin: Epidermis, Dermis, and Hypodermis. (B) This image depicts broken skin that serves as a channel for bacterial infiltration. Images created with BioRender.com.

Skin infections can be broadly classified as primary or secondary (Table1)

Table 1: Different types of Skin infections: Primary and Secondary Infections.³

Boil breakdown: causes, symptoms and remedies  

A boil (also called a furuncle) is a hard, painful, pus-filled lump caused by a skin hair follicle infection (Figure 2). They can be caused by bacterial, or fungal infections, viruses, or physical damage to the follicle.¹

Variations                                                                                     

Papule: Papules are acne that occurs as tender or sore small red bumps. 

Pustule: Pustules are similar to papules but have a white centre caused by pus accumulation.

Carbuncle: Carbuncles are a cluster of boils (Figure 2) that usually occur in the back of the neck or thigh region. These are rare and mostly affect middle-aged men. 

Figure 2: Different types of Skin hair follicle infection.⁴

Where do boils commonly occur?

• Face
• Neck 
• Armpits
• Groin
• Genital area
• Back
• Thigh

Why do boils happen? The battle under our skin 

• Bacterial infection: The most prevalent cause is a bacterial infection, typically by Staphylococcus aureus. These bacteria can enter the body via small wounds or cracks in the skin and infect hair follicles
• Ingrown hair follicles: When hair follicles get clogged with dead skin cells or other debris, this creates an environment for bacteria to thrive, resulting in infection
• Compromised Immune System: People with weak immunity such as HIV patients, Diabetics, etc., are more vulnerable to infections, including boils
• Poor hygiene can contribute to the occurrence of boils by enabling pathogens to accumulate in the skin
• Transmission: Boils can be transmitted via direct skin-to-skin contact with someone who has a boil or staph infection
• Boils are more likely to develop on areas of the skin that are subjected to friction or irritation, such as those caused by tight clothes
• Chronic Skin Conditions: Conditions that cause skin problems, such as acne or eczema, can increase your risk of developing boils⁵

Signs and symptoms:

• Hard
• Warmth or Tender
• Redness
• Swelling
• Size: Ranges from a cherry stone to a walnut 
• Centre may be yellowish due to pus accumulation

Decoding boils: diagnosis and beyond

In cases of simple boils, healthcare professionals identify them based on clinical appearance and symptoms

Meanwhile, in severe infections, diagnostic methods such as blood tests or pus swabs are employed to confirm. Patient samples are collected and sent to the lab. Blood tests can reveal whether or not a patient has any underlying medical condition. These samples also rule out MRSA involvement. Pus samples are necessary to evaluate both the source and spread of infection and help determine the antibiotics that will be most effective.⁶

Available treatment options 

Home remedies

Warm Compress: Applying a warm, moist compress to the affected area multiple times daily can help improve drainage and alleviate the pain. 

Keep it Clean: Use soap and water to clean the boil and the surrounding area. Avoid squeezing or puncturing the boil, as this might cause deeper infection.

Over-the-counter Pain Relief: Pain medications such as ibuprofen or acetaminophen can help reduce discomfort.

Medical interventions

Incision and Drainage: For deeper or more severe boils, a medical practitioner may need to perform an incision and drain the pus to relieve pressure. In a clinical environment, this is usually performed under local anaesthesia.

Antibiotics: In certain circumstances, particularly if the infection is extensive or recurring, antibiotics may help clear the infection and avoid consequences. However, antibiotics aren't always essential for healing boils.⁶

MRSA: The superbug threatening global health: Key facts and   insights

Staphylococcus aureus is one of the leading opportunistic infections of humans, colonising one-third of the world's population.¹ S. aureus appears in clusters or grape-like formations, as shown in Figure 1. They are responsible for numerous outbreaks in healthcare establishments and causing a variety of acute and chronic diseases.

S. aureus is broadly classified into:

• Methicillin Sensitive S. aureus variant (MSSA)
• Methicillin-Resistant S. aureus variant (MRSA)

MRSA infection is more likely in individuals who have recently undergone hospitalisation or surgery, hemodialysis, have human immunodeficiency virus (HIV), use medication via intravenous route, or have previously used antibiotics repeatedly.²

Antimicrobial resistance crisis

A Silent Global Threat: Antimicrobial resistance (AMR) occurs when bacteria, viruses, fungi, or parasites no longer respond to antibiotics. The WHO estimated 1.27 million deaths worldwide in 2019, declaring antimicrobial resistance (AMR) as a major global concern. They listed priority pathogens that pose significant challenges concerning AMR and must be addressed as soon as possible.⁷

Moreover, WHO has declared that S. aureus, particularly MRSA, is a serious worldwide concern associated with antimicrobial resistance (AMR). Circulating S. aureus strains were reported to be extremely antibiotic-resistant, thus restricting treatment options. As a result, a lack of timely treatment causes serious infections and a higher risk of mortality.²

Figure 3: This image presents the hallmarks of MRSA infection. Images created with BioRender.com.

Boils and MRSA: understanding the association

On a daily basis, our skin is exposed to a wide range of surroundings.  Skin infections are often overlooked and addressed as a general condition. Higher rates of skin infections are believed to be a result of close living conditions, increasing cases of skin abrasions, and inadequate hygiene practices creating an environment susceptible to colonisation, transmission, and infection with Staphylococcus aureus.⁸

MRSA infections are extremely common in healthcare settings, but they can also spread via ordinary objects such as phones, pagers, notebooks, ties, pencils, white coats, gloves, and isolation gowns. This ambient persistence makes long-term eradication of MRSA challenging and is likely to contribute to well-documented MRSA transmission in the community.² 

Therefore, it is extremely important to look for changes occurring in our bodies.

The risk associated with MRSA infection

MRSA infections can cause serious complications both within and outside healthcare facilities.

• Bacteraemia (Bloodstream transmission)
• Postoperative surgical site infections
• Sepsis
• Pneumonia
• Death if left untreated⁹

Table 2: The DOs and DONTs: Your Roadmap to Healthier Choices

Empirical treatment approaches in MRSA infections 

• Consult a General Practitioner
• Identify and eliminate the source of infection
• Proper drainage and debridement of the wound
• Good knowledge of the incidence and resistance profile of Staphylococcus aureus strains
• Risk factor consideration in a complicated clinical course 
• Presence of any other medical conditions
• Ongoing treatments, if any
• Response to prior antibiotics: Antimicrobial Susceptibility tests¹⁰

Summary

The Boil Story - From Sneaky Bacteria to Healing Skin:  Boils and MRSA are significant challenges in the field of Skin and Infectious disease. They develop when bacteria invade our skin via hair follicles or small wounds. Our body then responds by directing white blood cells to the infection area, resulting in redness and swelling. Plus, a mixture of microorganisms and dead cells, accumulates, resulting in a painful lump. As the battle progresses, the boil grows in size.  It eventually bursts, releasing the pus and allowing the skin to heal itself. 

Here comes a twist in the story, few boils are caused by Methicillin-resistant Staphylococcus aureus (MRSA), a bacterium that is resistant to several antibiotics. Therefore, MRSA-related boils are more difficult to treat and require medical assistance. 

It's important to keep your skin clean and dry to help prevent boils, and visit a doctor before they get swollen, or painful, or if you suspect MRSA involvement.