The UV Index provides a forecast of your likely UV exposureat noon. This forecast can help you determine what level SPF sunscreen will best protect your skin. Here is an explanation of how the UV Index works. The border is diffuse and blends in with surrounding tissue. If the lesion is ulcerated, there may be deep fibrosis and adherence to underlying structures.
Treatment is antibiotic ointment and perhaps systemic antibiotics.
If all else fails, skin grafting is required. Malignancies occasionally arise de novo , but are more likely to represent recurrences of previously treated lesions. Advanced Photodamage in a Normal Host Solar Elastosis EM . This is a disease of dermal sun damage which is irreversible. It does a wonderful job, but the irritation response has to be watched closely.