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Forehead Bump: 10 Differential Diagnoses & When to Biopsy
A persistent forehead bump warrants evaluation. Differential includes:
- Sebaceous cyst: Central punctum, mobile, keratinous content
- Lipoma: Soft, doughy, mobile, subcutaneous
- Dermatofibroma: Firm, dimple sign, often post-traumatic
- Skin tag: Pedunculated, fleshy, intertriginous areas
- Insect bite/sting: Acute, pruritic, resolves days
- Contusion/hematoma: History of trauma, evolves colors
- Epidermal/ganglion cyst: Firm, fixed to deeper structures
- Osteoma: Hard, fixed to bone, slow-growing
- Basal/squamous cell carcinoma: Pearly, ulcerated, telangiectatic; biopsy
- Melanoma: ABCDE criteria; urgent biopsy
When to Biopsy/Refer
- Growth, color change, ulceration, bleeding
- Size >6 mm, asymmetry, irregular borders
- Patient immunosuppressed or high UV exposure
Dermatologist evaluation recommended for any concerning lesion.
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