Seborrheic keratoses are very common on the back. They appear as waxy light tan, brown or black growths that look as if they were dripped onto the skin by a candle. Some can grow large, up to 1 inch 2. Seborrheic keratoses are usually round or oval and range in color from light tan to black. They can develop as a single growth or in clusters. A seborrheic keratosis usually appears as a brown, black or light tan growth on the face, chest, shoulders or back.
Study record managers: refer to the Data Element Definitions if submitting registration or results information. Background Actinic keratoses AKs are often treated separately, lesion by lesion. However, in the past years, AKs have been described as a field disease and not limited to single clinically apparent lesions. Treatment should therefore target an area of field change which may treat the subclinical AKs and reduce the risk of development of further AKs, second tumours, and local recurrence.
As you get older, you may begin to notice rough, scaly spots appearing on your hands, arms, or face. They form when you have actinic keratosis AK , which is a very common skin condition. AK occurs when skin cells called keratinocytes start to grow abnormally, forming scaly, discolored spots. The skin patches can be any of these colors:.