Brown spot (sun damage) roughly the size of a pencil eraser, that I have had for years on left index finger between finger joint and knuckle that over the last week or two has gone from it's regular light brown color to being reddish, to now a slightly raised blister sensitive to warm and hot water that intermittently itches like a healing wound. It remains the same diameter as the original brown spot. Responds well to Neosporin, seems to help heal, but have not regularly applied it. I am a healthy 53 year old female, with a strong immune system. I do have multiple other brown spots (sun damage) on hands and a few on face that have remained the same over many years. It is winter time where we live, so this flare up is not agitated by more sun exposure.
When a sun damage spot changes, we must be concerned that it may be evolving into a precancer or skin cancer. Although likely the blistering is from irritation (sun damage spots have thinner and more fragile skin than normal skin). It is still in your best interest to have your doc or dermatologist evaluate it and perhaps even do a small biopsy.
I hope that helps
Dr. Mohiba Tareen Tareen Dermatology, Roseville, Minn Castle Connoly's America's Top Cosmetic Dermatologists Adjunct Assistant Professor Univ of MN Dept of Dermatology www.TareenDermatology.com
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