This is related to my scalp. About 8 or 9 years ago we went to Puerto Rico and went snorkeling. We were in deep water ,but when I came up I had this stuff in my hair and it felt gritty almost like sand ?? We had a few miles back to shore and the sun was real hot. That evening I started scratching and felt like I couldn t stop. Till we got home I had almost my entire scalp scratch open. The 1st two years I tried everything , went to a dermatologist had injections , nothing seemed to help. I would get some relief for awhile and it would start all over . It is somewhat better , except I still scratch it feels like my scalp is gritty with bumps ,and just recently I had a secbacous cyst removed it was 3 1/2 x 7 1/2 inches . Just don t know what to do anymore.