In the adult, many conditions can affect the back of the hand. Many of the more worrisome conditions are caused by a lifetime of sun exposure. Age spots (solar lentigo) are not cancerous but are evidence of significant sun exposure on unprotected skin. Actinic keratosis is a scaly thickening of the skin that can become cancer if left untreated. Keratoacanthoma is a type of skin cancer that will grow rapidly (over 4-6 weeks) and causes a dramatic crusted skin growth. The other skin cancers (eg, melanoma, squamous cell carcinoma, basal cell carcinoma) are all common to the hands. Click the pictures below for more information on these and other conditions.
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