Yes, your mother can safely use topical minoxidil for hair thinning, even after stopping thyroid medication, as it is not contraindicated for well-controlled subclinical hypothyroidism (elevated TSH levels with normal T4 levels). Minoxidil works locally on the scalp to stimulate hair growth and does not affect thyroid function. Her hair loss may be related to hormonal changes after stopping long-term thyroid treatment, which can sometimes cause temporary shedding. She should start with the recommended dose for women and monitor for scalp irritation. If she develops any unusual symptoms or has other health conditions, consult her doctor before continuing.

The itching and dandruff you are experiencing are likely caused by propylene glycol or alcohol present in standard liquid minoxidil. I highly recommend switching to Minoxidil Foam (such as Rogaine Foam), which is propylene glycol-free and much gentler on the scalp. Alternatively, you can consult a dermatologist for a prescription for compounded alcohol-free minoxidil, or look for commercial ?No-PG? (propylene glycol-free) minoxidil liquids. To soothe your scalp in the meantime, try using a ketoconazole shampoo (like Nizoral) twice a week. If irritation persists, please consult your doctor.

Hair fall after typhoid is usually due to telogen effluvium, a temporary shedding phase that improves in 3 to 6 months. Continue 5% minoxidil regularly, eat a protein-rich diet, check iron/Vitamin D levels, and avoid stress; hair growth typically recovers with time.