Overview

Pyogenic Granuloma (PG), also known as granuloma pyogenicum, is a benign vascular tumour commonly found in tissues such as the skin and mucosal membranes.¹ Typically, PG occurs in adults aged 20–50 years.² It is often alarming due to its striking appearance — a solitary, bright red, highly vascularised mass.³ PGs show rapid exophytic growth (growing outwards beyond the surface) and are most frequently located within the oral cavity,¹ though they can also appear on the hands, face, or near the fingernails.

Although non-cancerous, PGs can closely mimic serious skin cancers such as melanoma and squamous cell carcinoma (SCC).⁴ Not only that, but they may also still cause pain, bleeding, and poor wound healing. The mortality rate in affected individuals is reported to be three times higher than in the general population.

Causes

PG has no single cause but may be influenced by several contributing factors. Despite its name, pyogenic (“pus-producing”) is a misnomer. PG is not infectious and is not caused by bacteria or viruses.⁵

The most common trigger is minor trauma or irritation. Cuts, scratches, insect bites, or friction from rings or footwear can provoke excessive tissue repair, forming a vascular mass as the body overreacts to injury.⁶⁻⁷

Hormonal factors also play a role, particularly during pregnancy, giving rise to the so-called “pregnancy tumour”. This lesion typically forms in the mouth or on the gums due to increased oestrogen and progesterone levels.⁸

Certain medications can also induce PG-like lesions by altering blood vessel growth. These include retinoids, oral contraceptives, and some HIV drugs such as indinavir.⁹ Regardless of the cause, PG represents an overgrowth of small blood vessels, forming a smooth, red bump that bleeds easily — a benign vascular proliferation rather than a malignancy.

Why is it confused with skin cancer?

PG can easily be mistaken for malignant lesions, particularly melanoma and SCC.

The presentation varies: some patients develop one or two slowly growing ulcers, while others notice the sudden appearance of multiple rapidly enlarging nodules.² The fast growth rate — over days or weeks — may suggest a nodular melanoma. Another factor contributing to confusion is that PGs are highly vascular, bleeding readily with the slightest contact.¹⁰ This bleeding, also seen in melanoma and SCC, raises clinical suspicion of malignancy.

While melanomas are usually dark brown or black, and SCCs often appear as red, scaly or crusted plaques, PGs can share these colour features. Their bright red or occasionally darker pigmentation often contributes to diagnostic uncertainty.

Melanoma

Melanoma is a potentially life-threatening cancer of melanocytes, the pigment-producing cells of the skin.¹¹ It may affect anyone but is more common in older adults, fair-skinned individuals, and those with a family history or numerous moles. However, darker-skinned individuals can also develop melanoma, typically on sun-protected areas such as the soles or palms.¹²

Early detection is essential. Clinicians often apply the ABCDE rule for diagnosis:¹³

• (A) Asymmetry: irregular shape or structure
• (B) Border irregularity: uneven or notched margins (scored 0–8)
• (C) Colour variation: differing shades (white, red, brown, dark brown, blue-green, black)
• (D) Diameter: greater than 6 mm
• (E) Evolving: changes in size, shape, or colour over time

Dermoscopic analysis allows dermatologists to compute a total dermoscopic score (TDS):¹⁴⁻¹⁶

• TDS < 4.75 = benign
• 4.75–5.45 = suspicious
• 5.45 = likely malignant melanoma

Squamous cell carcinoma 

SCC is the second most common skin cancer, developing from squamous cells in the middle and outer skin layers.¹⁷ Chronic sun exposure and tanning beds are major risk factors, though SCC can also arise from scars or chronic wounds, particularly in immunocompromised individuals.¹⁸

Clinically, SCC presents as a firm, scaly red nodule or crusted patch that can be mistaken for PG. Areas most affected include the face, lips, ears, scalp, and backs of the hands.¹⁷⁻¹⁹ Early recognition and treatment are crucial to prevent deeper invasion or metastasis.

Differential diagnosis 

At early stages, distinguishing PG from melanoma and SCC can be difficult. Clinicians use a combination of patient history, physical examination, dermatoscopy, and biopsy.

• Patient history: Questions include how long the lesion has been present and how quickly it has grown. PG tends to grow faster than melanoma or SCC. Other factors include recent trauma, pregnancy, or sun exposure, as all raise lesion risk²⁰
• Physical examination: The doctor assesses lesion shape, texture, and size. They also note location and possible trauma or UV exposure. PGs bleed also easily on contact²¹
• Dermatoscopy: This magnified skin examination can distinguish PG’s lobular vascular pattern from the irregular colour and asymmetry typical of melanoma or the scaly patches of SCC²²
• Biopsy: If malignancy is suspected, tissue sampling confirms the diagnosis. A benign histology indicates PG, while atypical or malignant cells confirm melanoma or SCC

Treatments and outcomes

• PG: Although harmless, PGs are typically removed because they bleed easily. Treatment options include laser therapy, surgical excision, or cryotherapy (freezing).²³ Recurrence is uncommon once the lesion is completely removed
• Melanoma: Early detection is crucial, as melanoma can spread rapidly. Treatment usually involves surgical excision, sometimes combined with lymph node biopsy or imaging. Long-term monitoring is essential to detect recurrence or new lesions²⁴^,²⁵
• SCC: SCC is generally treated with surgical excision, although chemotherapy, topical creams, or radiation may also be used. An example is 5-fluorouracil (5-FU) cream.²⁶ Early detection often allows a complete cure.²⁷ Ongoing skin surveillance helps prevent future cancers

FAQs

Is PG contagious?

No. It is not bacterial, fungal, or viral.

What causes a PG?

Injury or trauma, pregnancy-related hormonal changes, or certain medications.

Can a PG turn into cancer?

No. It is benign and does not increase cancer risk, though it can mimic malignant lesions.

Why does a PG bleed so much?

It consists of numerous fragile blood vessels, making it prone to bleeding from minimal friction.

Will it go away on its own?

Occasionally. Pregnancy-related PGs may regress as hormones stabilise, but treatment is generally recommended to prevent recurrence.

Summary

It is vital to distinguish PG from melanoma and SCC to ensure accurate diagnosis. PGs typically appear as red, smooth, fast-growing lesions that bleed easily yet remain benign. In contrast, melanoma and SCC are malignant and may spread quickly if untreated. Microscopic examination and biopsy are essential for confirmation. Although PG is harmless, vigilance is key to ruling out cancer.