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Crusts form on my scalp and sometimes bleed when I scratch them.

To limit the formation of crusts on your scalp, you can try using medicated shampoos specifically designed for dandruff and psoriasis. These shampoos can help control the shedding of dead skin cells on your scalp. You can also try rubbing olive oil on the scales 30 minutes before washing your hair. If changing your shampoo doesn't work, it may be best to consult a doctor for further advice.