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Minoxidil can cause hair to turn yellow.

Normal cells stain well with fluorescent globulin, but tumor cells do not.

Lipophilic dyes accumulate more in hair follicles when delivered with surfactant-propylene glycol solutions.

Hair casts and cutaneous spicules can be signs of multiple myeloma.

Hair dye can make it hard to diagnose scalp conditions correctly.

The dye quickly penetrates hair follicles, mainly through the gap, not the surrounding skin.

Eating phenylthiocarbamide made all the rats' hair go gray, but some returned to their original color after stopping.

Valproic acid can rarely cause reversible nail discoloration.

Trichoscopy can diagnose hair loss by looking for common signs like uneven hair thickness, "yellow dots," and more thin hairs, which are found in both men and women.

Trichoscopy helps tell apart scalp lesions in pemphigus vulgaris and pemphigus foliaceus and is useful for choosing biopsy locations.

A 15-year-old boy's smelly, yellow armpit hair improved with clindamycin treatment.

The woman likely has secondary syphilis, treatable with penicillin.

Using poppers can cause vision problems, but stopping their use might lead to complete recovery over time.

Trichoscopy effectively visualizes scalp micropigmentation without invasive methods.

Dermoscopes help tell FPHL apart from other hair loss types and can detect it early by identifying specific patterns.

The document concludes that MGRN1 affects mouse fur color by interfering with a receptor's signaling, but its full role in the body is still unknown.

Moderately lipophilic dyes penetrate skin deeply, while highly hydrophobic or lipophilic dyes stay on the surface.

Ponatinib can cause a rare skin reaction that resolves with topical treatment and temporary drug discontinuation.

Exclamation-mark hairs and yellow dots indicate alopecia areata, while follicular ostia loss and white scarring indicate lichen planopilaris and discoid lupus erythematosus.

Dermoscopy is useful for diagnosing lichen planopilaris and certain features may relate to disease duration, age, and gender.

Protoporphyrin IX is useful in cancer treatment but can cause health problems if not properly regulated.

Comma hairs are a specific sign of tinea capitis when viewed with videodermatoscopy.

Diphencyprone can cause unexpected and possibly permanent vitiligo.

The patient's hair has unique structural differences with alternating bright and dark bands.

Knuckle darkening can be an early sign of vitamin B12 deficiency.

Minoxidil detects nitrite in water, creating a simple, cheap test.

New, eco-friendly methods accurately measure TDF and FNS in a new urologic medication.

Avoiding dyed wigs and clothing improved severe allergic reactions in a woman treated with diphencyprone.

Riboflavin with blue light speeds up hair dyeing, making it faster, safer, and long-lasting with less hair damage.

Dermoscopy has greatly improved the diagnosis of skin lesions and our understanding of their morphology and biology.