Scalp grows like a scab, can be considered by ringworm, scalp psoriasis or seborrheic dermatitis and so on. 1. ringworm of the head: caused by ringworm infection that involves the scalp and hair, ringworm of the head mostly involves children, according to the causative organisms and different clinical manifestations, it is divided into four types of ringworm of the head: tinea cruris, tinea alba, tinea cruris nigra and tinea cruris pustulosa, such as tinea cruris, the skin lesion is a red spot, which can be covered with thin flaky scales, and gradually form yellow scabs. 2. Psoriasis: When psoriasis appears on the scalp area, the rash is scattered or fused into patches, and thick scales will appear, which can go beyond the hairline and make the hair appear in bundles. 3. Seborrheic dermatitis: In seborrheic dermatitis of the scalp, greasy thick scales appear and inflammation under the scabs is obvious. When there are a lot of scales or scabs on the scalp, it is recommended to go to the hospital specialist in time and follow the doctor’s instructions for treatment.