Excimer Laser for Scalp Psoriasis: The excimer laser emits a targeted beam of UVB light at 308 nm, which has been shown to be effective in treating various forms of psoriasis, including those on the scalp. How it Works: The laser light penetrates the skin and interacts with immune cells, reducing inflammation and potentially slowing down the overproduction of skin cells that contribute to psoriasis. Not a Direct Dandruff Treatment: While the excimer laser can help with the symptoms of scalp psoriasis, it's not typically used for treating dandruff caused by fungal infections or other factors. Scalp Psoriasis and Dandruff: Scalp psoriasis can cause significant flaking and itching, similar to dandruff. If you have both, treating the psoriasis with excimer laser might improve the overall condition of your scalp and reduce the appearance of flakes.