How can I get rid of this white powder on my head?
Taking that the white “powder” on head to be dandruff, that is, white flakes of dead skin.
This may also cause itchiness and scaling of the scalp. This can be due to seborrheic dermatitis, where the skin is irritated, inflammed and oily; fungal infection; contact dermatitis, that is, irritation of your skin because of being sensitive to hair products; dry skin; or build-up of dirt and skin cells because of not washing hair regularly.
Dandruff is more common in men, in people who have oily scalps, in people who have some neurological diseases and those with weak immune systems.
Treatment for dundruff
The condition may last for several years or even a lifetime. To manage it, wash your hair and scalp daily with a mild shampoo to remove dead cells and dirt. Also avoid scratching your scalp because it irritates the skin, which may lead to more itchiness and scaling.
Avoid over-drying your scalp e.g. by being in the sun for long or due to poor hydration. If this doesn’t work, you can use medicated shampoos, and you may need to try several until you find one that works for you.
Other conditions that can cause formation of the white “powder” on your scalp include atopic dermatitis (skin allergy), tinea corporis (fungal infection), psoriasis (autoimmune disease causing itchy scales on the skin due to overgrowth of skin cells) and rosacea.
In any case, if you have tried several remedies, you would benefit from visiting a skin specialist (dermatologist) for examination of the skin, diagnosis and treatment.