Describe this skin lesion

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Finding Sources

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Knuckle Pads (Heloderma / Garrod Pads)

The image shows the dorsum of a hand with multiple well-defined, round, flesh-colored to slightly whitish, plaque-like thickenings located over the proximal interphalangeal (PIP) joints of the fingers. The skin surface overlying the lesions appears slightly hyperkeratotic. The lesions are discrete, small (consistent with the typical 10-15 mm size range), and distributed symmetrically across multiple fingers.

This morphology is highly consistent with knuckle pads (heloderma).

For comparison, the textbook reference image from Andrews' Diseases of the Skin:

Description

Feature	Finding
Location	Extensor aspect of PIP joints (dorsal hand)
Morphology	Well-defined, round, plaque-like, fibrous thickenings
Color	Flesh-colored to slightly pale/whitish
Surface	Normal to mildly hyperkeratotic epidermis
Size	Approximately 10-15 mm
Mobility	Part of skin, freely movable over deeper structures

Key Facts

Knuckle pads are benign fibrous thickenings (histologically fibromas) of the skin over the PIP and/or MCP joints.
They develop at any age, grow over weeks to months, and then persist permanently.
Associated conditions include:
- Dupuytren contracture, Peyronie disease, plantar fibromatosis (all superficial fibromatoses)
- Camptodactyly, clubbing
- Bart-Pumphrey syndrome (autosomal dominant: knuckle pads + leukonychia + hearing loss + keratoderma - GJB2 mutations)
- Epidermolytic palmoplantar keratoderma (keratin 9 mutation)
- Repetitive trauma or knuckle-cracking habit

Differential Diagnosis

Condition	Distinguishing feature
Gottron's papules (dermatomyositis)	Violaceous/erythematous, associated with proximal muscle weakness, heliotrope rash
Rheumatic nodules	Deeper, non-skin lesions, associated with rheumatic disease
Nodular neurodermatitis	Pruritic, lichenified
Post-frostbite/acrocyanosis papules	Hemispheric, pitted, history of cold exposure
Pachydermodactyly	Swelling lateral to PIP joints (not over the joint), adolescents

Management

Usually no treatment required (benign, asymptomatic)
Intralesional corticosteroids may reduce the thickening
Intralesional 5-fluorouracil (5-FU) - similar to keloid treatment, may be beneficial
Address any underlying repetitive trauma if identified

Source: Andrews' Diseases of the Skin: Clinical Dermatology, p. 704

Important note: This is a morphological description based on the image. A definitive diagnosis requires clinical examination and, if needed, histopathology. Please consult a dermatologist for formal evaluation and management.

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