Scalp Showing Through

A: This is a fairly common concern for women with very light or white hair, because the contrast between the hair and the color of the scalp can make the scalp particularly noticeable.
However, finding a seamless match for extremely light blonde hair may require testing a few choices. Select the lightest shade that blends with your hair rather than choosing a product that is noticeably darker.
Alternatively, you can use a matte cosmetic powder in a very pale, neutral tone to soften the contrast between your pink scalp and your light hair at the part. A root-concealing powder is convenient for this, but a suitable matte face powder can also work. Apply it sparingly with a small brush, concentrating on the visible scalp rather than coating the surrounding hair.
Make sure the hair and scalp are clean and completely dry before applying the product. This will help prevent the powder from becoming cakey or clumping in the hair. Check the result in natural daylight, since a shade that looks right indoors may look different in brighter light.
For a pink scalp, a slightly neutral or beige-toned product may reduce the contrast more effectively than a very white product, which can sometimes make the area look chalky. But this is a matter of color matching rather than a hard-and-fast rule, so you may need to experiment with small amounts to see what looks best with your hair and skin tones.
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See also:
Hair color and skin tone
See through hairs
Why does white hair turn brown when wet?