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Polarizing light microscopy can easily and reliably diagnose congenital keratinizing disorders like Netherton syndrome.

Vitamin B12 deficiency can cause skin darkening and white hair, but it's reversible.

Melanocytes produce melanin; their defects cause vitiligo and hair graying, with treatments available for vitiligo.

SPRY1 deficiency in skin cells causes stem cells to move to the skin surface, leading to increased pigmentation.

Merkel cell increase is specific to certain skin diseases, not general skin growth.

A rare skin condition with dark, thick, warty patches and some hair loss was found in a newborn boy.

Vitamin B12 deficiency can cause reversible skin darkening.

Two cases showed skin abnormalities without bone or neural defects.

Melanin granules can be expelled by exocytosis.

Pigmentary mosaicism causes skin color changes and can affect multiple body systems, but has no cure.

A rare benign skin growth called melanocytic matricoma was identified in a 69-year-old man.

Melanocytes are crucial for skin pigmentation and can affect conditions like melanoma, vitiligo, and albinism, as well as hair color and hearing.

A pregnant woman's skin condition improved after giving birth, possibly due to high estrogen levels during pregnancy.

Two cases of hairy elbows syndrome were described, with normal skin texture and symmetrical hair growth.

A 14-year-old girl's black hair showed unique color changes, suggesting early greying.

Hair and nail disorders can cause changes in scalp pigmentation, especially with sun exposure and alopecia.

Pigmented rings with central clearing help diagnose melasma more accurately.

Iron deficiency can cause hair color changes, which can be reversed with iron supplements.

The PER3 rs772027021 SNP may cause mild skin pigmentation changes in a new subtype of dyschromatosis universalis hereditaria.

Hair follicles protect melanocytes from sun damage, helping them replenish skin.

A new gene mutation may allow some piebaldism patients to regain skin color in white patches.

A 3-year-old girl has a rare condition causing sparse hair and nail issues, with minimal improvement from treatment.

Dermatopathia pigmentosa reticularis causes skin discoloration, hair loss, and nail problems.

Hyperpigmentation is common in pregnancy and may not fully fade after birth; melasma, also frequent, can persist but has limited treatment options during pregnancy.

Some Greek melanoma patients have gene mutations linked to increased cancer risk, a new color feature helps diagnose melanoma, the incidence of a skin condition in the Netherlands is rare, and a gene possibly affects male-pattern baldness.

Taking vitamin B6 corrected a pregnant woman's metabolic disorder, which changed her hair color.

Lower ferritin and serum iron levels may be linked to melasma.

Treating melasma in men is difficult, especially for the deeper skin layers, and may need more than just topical treatments.