6 Skin, Hair & Nail Signs You Should NEVER Ignore (From a Dermatologist) | Dr. Idriss

Certain changes in your skin, hair, and nails are not cosmetic problems. They are visible signals of hormonal, autoimmune, and metabolic conditions happening underneath, and most of them will never respond to a change in skincare routine. In this video, board-certified dermatologist Dr. Shereene Idriss breaks down six specific signs she sees every week in her practice, what each one actually means, and when you need bloodwork instead of another product. What the video covers: Dr. Idriss explains why persistent jawline acne combined with coarse hair growth on the upper lip and chin points to excess androgens and polyendocrine metabolic ovarian syndrome, known as PMOS, the condition renamed from polycystic ovary syndrome or PCOS in May 2026. She covers why a sudden smooth round bald patch on the scalp is alopecia areata rather than normal shedding, why the follicle is not destroyed so regrowth is possible when treated early, and why she checks vitamin D, thyroid function, a full iron panel including ferritin, and hemoglobin A1c in every one of those patients. She explains how a butterfly rash that crosses both cheeks and the bridge of the nose, spares the nasolabial folds, and flares hours to days after sun exposure can indicate cutaneous or systemic lupus, and gives three specific clues that point to rosacea instead. She describes xanthelasma, the soft yellow patches at the inner corners of the eyelids that can signal elevated cholesterol and that should never be cosmeticall