How to treat an itchy and bleeding scalp?

Hello, This has been ongoing for approx a week, had before when young but no idea why. I have about 4/5 slightly raised sores on my head that are very itchy and scab, sores are bleeding and weeping. Sores are quite spread out. Scalp is very itchy. No white or yellow flakes or scales. Small white dandruff in hair more when itching scalp but no white scales on scalp. No burning I have some hair loss assuming caused by pcos (diagnosed) Tried medicated shampoos but painful on open sores. Washing frequently and massaging scalp but no effect.