There are three main types of<unk> : basal-cell<unk>  (basal-cell carcinoma) (BCC), squamous-cell<unk>  (squamous-cell carcinoma) <unk> C) and malignant melanoma. Cancer Description Illustration Basal-cell carcinoma Note the pearly translucency to fleshy color, tiny blood vessels on the surface, and sometimes ulceration which can be characteristics. The key term is translucency. 150px Squamous-cell<unk>  carcinoma Commonly presents as a red, crusted, or<unk> aly patch or bump. Often a very rapidly growing tumor. 150px Malignant melanoma These are commonly asymmetrical in shape and/or pigment distribution, with an irregular border, color variation, and often greater than 6 mm diameter. 150px Basal-cell carcinomas are most commonly present on sun-exposed areas of the<unk> , especially the face. They rarely metastasize and rarely cause death. They are easily treated with surgery or radiation. Squamous-cell<unk> s are also common, but much less common than basal-cell cancers. They metastasize more frequently than BCCs. Even then, the metastasis rate is quite low, with the exception of<unk> C of the lip, ear, and in people who are immunosuppressed. Melanoma are the least frequent of the three common<unk> s. They frequently metastasize, and potentially cause death once they spread. Less common<unk> s include: dermatofibrosarcoma protuberans, Merkel cell carcinoma, Kaposi's sarcoma, keratoacanthoma, spindle cell tumors, sebaceous carcinomas, microcystic adnexal carcinoma, Paget's disease of the breast, atypical fibroxanthoma, leiomyosarcoma, and angiosarcoma, and porocarcinoma. BCC and<unk> C often carry a UV-signature mutation indicating that these cancers are caused by UVB radiation via direct DNA damage. However malignant melanoma is predominantly caused by UVA radiation via indirect DNA damage. The indirect DNA damage is caused by free radicals and reactive oxygen species. Research indicates that the absorption of three sunscreen ingredients into the<unk> , combined with a 60-minute exposure to UV, leads to an increase of free radicals in the<unk> , if applied in too little quantity and too infrequently. However, the researchers add that newer creams often do not contain these specific compounds, and that the combination of other ingredients tends to retain the compounds on the surface of the<unk> . They also add that frequent re-application reduces the risk of radical formation.
Skin cancer
Cancer
Breast disease
Oral cancer
Squamous cell skin cancer
Breast cancer
Melanosis
Dermatitis