Dermatofibroma – Consultant Diagnosis & Removal in London

Understanding dermatofibroma

A dermatofibroma is a small, firm nodule in the skin, commonly found on the legs, arms, or shoulders. These growths are non-cancerous and develop when fibrous tissue grows excessively within the dermis. They are considered harmless but may raise concern due to appearance or unusual persistence.

Causes and development

The exact cause of dermatofibromas is not fully understood, but they often develop after minor trauma to the skin such as insect bites, ingrown hairs, or small injuries. The lesion is a localised overgrowth of fibroblasts, cells responsible for connective tissue repair.

Clinical features

Dermatofibromas are usually less than 1 cm in size, firm, and slightly raised. Their colour can range from brown and red to purple. A distinctive feature is the “dimple sign”: when the lesion is pinched, it tends to dimple inward. They are usually asymptomatic but can sometimes cause itching or tenderness.

Who gets dermatofibromas?

These growths are more common in adults and especially in women. They typically arise between the ages of 20 and 50. Patients with a history of frequent insect bites, skin trauma, or a predisposition to develop keloids may be more likely to experience them.

Diagnosis

A dermatologist can usually diagnose dermatofibroma based on clinical appearance and the dimple sign. In rare cases where the diagnosis is uncertain, a biopsy may be taken to rule out other skin conditions such as dermatofibrosarcoma protuberans (DFSP), a rare skin cancer.

Management and treatment options

Most dermatofibromas do not require treatment as they are harmless and stable. However, removal may be considered in cases of discomfort, repeated trauma, or cosmetic concern. Treatment options include:

• Surgical excision: Complete removal of the lesion; ensures diagnosis and prevents recurrence.
• Shave excision: A less invasive method but may leave part of the lesion behind.
• Laser therapy: Can flatten or lighten the lesion for cosmetic improvement.
• Observation: Many patients opt to leave them untreated when there are no symptoms.

Prevention and aftercare

Dermatofibromas cannot always be prevented, but minimising skin trauma may reduce risk. After removal, proper wound care and monitoring of the area help ensure good healing. Scarring may occur depending on the removal method chosen.

Special considerations

In individuals with darker skin tones, dermatofibromas may appear more pigmented and be mistaken for melanocytic lesions. Careful assessment is required to differentiate them. For patients with multiple dermatofibromas, an underlying systemic cause such as immune suppression should be considered.

Why choose Skinhorizon?

At Skinhorizon, our dermatology experts offer thorough assessment and safe removal of dermatofibromas when needed. We prioritise both diagnostic accuracy and cosmetic outcomes, providing tailored treatment in a CQC-regulated clinical environment.

Your first visit — what to expect

1. Consultation: Detailed assessment of the lesion and medical history.
2. Examination: Confirmation of diagnosis, sometimes supported by dermoscopy.
3. Discussion: Options explained, including monitoring versus removal.
4. Treatment: If removal is chosen, procedure performed under local anaesthetic.
5. Aftercare: Guidance on wound healing and follow-up if required.

Reviewed by: Dr Mohammad Ghazavi, Consultant Dermatologist
Skinhorizon Clinic, 4 Clarendon Terrace, Maida Vale, London W9 1BZ
Last reviewed: 20 August 2025