White stuff on the scalp after washing your hair may be dandruff, crumbs from ringworm, crumbs from seborrheic dermatitis, etc. 1. Dandruff: substances produced by the normal metabolism of the scalp, if not cleaned up properly when washing hair, white stuff can be found. 2. Dandruff of tinea capitis: when the fungus infects the scalp and hair, it can trigger tinea capitis, especially tinea alba, which often manifests itself as round patches on the scalp accompanied by white scales, and will cause some of the white scales to fall off after washing the hair. 3. Seborrheic dermatitis flakes: Patients with seborrheic dermatitis usually have itching, erythema and flaking flakes on the affected skin, so white flakes may appear after shampooing. It is recommended that people who have white stuff on their scalp after washing their hair should go to the regular hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor, so as not to bring adverse effects to the body due to the delayed condition.