Overview

Fox-Fordyce Disease (FFD) is a rare, chronic skin disorder that affects apocrine sweat glands—these are the smell glands located in regions like the Armpits (axillae), Groin, around the nipples (areolae) and Perineum (genital and anal region)
Among the symptoms, Papules are tiny, hard, and irritating lumps that range in colour from the skin to slightly pigmented. Often appearing in clusters, Pruritus, or severe itching, is common and can get worse when you perspire, are stressed, or are in hot weather. There may be involvement of hair follicles (follicular papules), and occasionally, the affected area has a decrease in sweat production.

Introduction

Fox-Fordyce disease (also known as apocrine miliaria) is a rare skin illness that primarily affects women aged 13 to 35 years.¹
George Henry Fox and John Addison Fordyce published the first description of Fox-Fordyce illness in 1902. It is a rare inflammatory disease of the apocrine sweat glands that causes extremely pruritic follicular papules in apocrine gland-bearing sites, such as the axillae, groins, pubic region, perineum, labia majora, areola, and umbilicus.

The lesions are most commonly recorded in apocrine gland skin areas, such as the axillae and anogenital regionThey are thought to be produced by keratin clogging of the hair follicle infundibulum, which disrupts apocrine gland secretion.⁵ The disease is characterised by extreme itching, particularly in the underarm and pubic areas.⁶

Causes

The specific etiopathogenesis of the condition remains unknown. Some case reports indicate that laser hair removal therapy may cause the condition.²

Symptoms

Emotional, physical, or pharmaceutical stimuli that promote apocrine perspiration exacerbate itching.² Later on, skin-colored or slightly hyperpigmented dome-shaped hyperkeratosis with follicular plugging and minor lymphocytic infiltration, along with follicular papules, appear.⁶ Heat, humidity, friction, and stress aggravate the symptoms.⁴

Histologic features

The most consistent histologic findings are infundibular dilation and hyperkeratosis, with accompanying perifollicular foamy histiocytes, which serve as a diagnostic signal. The presence of cytoplasmic mucin is what gives these cells their frothy look.¹ There is also an inflammatory infiltration in the perifollicular and perivascular areas. Perifollicular foamy cells may be the disease's histopathologic signature.²

Treatment

There is no need for therapy unless the spots cause discomfort, which is uncommon. Some people seek treatment for cosmetic reasons or because their spots have become bothersome. There is currently no definitive treatment for Fox-Fordyce illness. However, several different therapy methods have demonstrated varying success in tiny subsets of patients. Previously, numerous medications were applied to this condition, including topical and intralesional use of corticosteroids, topical or systemic retinoid, clindamycin, benzoyl peroxide, oral contraceptives, isotretinoin, and phototherapy.^2,7

However, specific case studies suggest that topical pimecrolimus and tacrolimus, excision-liposuction and curettage, fractional carbon dioxide laser, pulsed dye laser, and other treatments may be used to eliminate cutaneous lesions.^2,9

A new noninvasive technology that uses microwave energy to target the dermal-hypodermal junction.

This microwave device, marketed as MiraDry (Miramar Labs Inc), uses a 5800-Megahertz microwave frequency to generate dielectric heating at the dermal-hypodermal junction, destroying sweat glands and hair follicles.

The epidermis and papillary dermis restrict thermolysis to the dermal-subcutaneous interface, which joins cooled top layers and inert subcutaneous tissue.⁸

Chronicity

Fordyce spots are typically a lifelong condition that persists over time. They may be present at birth, but they become more visible during puberty owing to hormonal changes. The illness is deemed benign and has no health hazards, yet it can last permanently in many cases. The use of fractional CO2 lasers in the treatment of FFD has also been documented; however, only short-term results have been published.³

Factors influencing chronicity

1. Hormonal changes: The spots may become more noticeable as a result of hormonal changes, particularly during puberty and later in life (such as with ageing or specific situations like pregnancy)
2. Hereditary predisposition: There may be a hereditary component to some people's increased susceptibility to noticeable Fordyce spots
3. Skin Type and Sebaceous Gland Activity: Fordyce patches may be more obvious in those with naturally oilier skin or more active sebaceous glands
4. Lifestyle factors: Although there is no clear correlation between chronicity and lifestyle factors, the appearance of Fordyce spots may change depending on things like nutrition, stress, or hygiene

Triggers for recurrence

• Sweating and heat are prevalent during the summer
• Anxiety or tension
• Using items like deodorants or tight garments that cause irritation to the skin or clog pores
• Treatment discontinuation. However, after therapy ends, relapse is common. Long-term care may be required; no single treatment is always effective
• Topical steroids, calcineurin inhibitors, retinoids, clindamycin, oral contraceptives, and oral isotretinoin are among the treatment options that have been documented; however, their effectiveness has been limited due to the tendency of lesions to recur after treatment is discontinued, and all of these approaches have been linked to high rates of recurrence³

Patterns of recurrence

How to minimise recurrence

1. Long-term Maintenance Therapy: To sustain remission, clindamycin or topical retinoids may be used sporadically
2. Control of Hormones:
   • Oral contraceptives or anti-androgens can be helpful in circumstances when hormones are involved
3. Lifestyle Changes:
   • Steer clear of triggers, such as heat, perspiration, tight clothing, and shaving
   • Steer clear of irritants and use mild cleaners
4. Procedural Therapies (for instances that are recurrent or resistant):
   • Apocrine gland destruction using a CO₂ laser or laser hair removal
   • Microwave therapy or liposuction-assisted curettage (experimental)
   • A combination of surgical excision of significant lesions and infrared erbium glass 1,550-nm laser treatment for less severe lesions can be a safe and very successful therapeutic method to reduce surgical complications and the chance of recurrence of areolar FFD³

Prognosis

•  FFD is not harmful, despite being persistent.
•  In some cases, particularly those that occur after menopause, resolve on their own.
• Nonetheless, many individuals experience recurring flare-ups over several years.

Conclusion

In conclusion, based on clinical and histopathologic characteristics, Fox-Fordyce illness is easily diagnosed despite its rarity.
The primary pathophysiologic mechanism is believed to be a hyperkeratotic plug that causes infundibular blockage and dilation of the apocrine duct. A retention cyst, ductal rupture, and an inflammatory reaction to the substance ejected could result from this.

The severe itching that frequently accompanies the lesions may be caused by lymphohistiocytic infiltration. Although the exact aetiology of FFD is yet unknown, stress, hormones, and genetics are all believed to play a role. Combining surgical excision of significant lesions with infrared erbium glass 1550-nm laser treatment for less severe lesions can be a safe and very effective way to reduce surgical complications and the chance of recurrence of areolar FFD.