Hi doctor, Can you please provide me with your opinion on a white patch under my tongue. It does not rub off and just noticed it a few days ago. I am currently on Losartan 100 mg.
Hello,  Welcome to icliniq.com.  I understand your concern and saw your clinical pictures. (attachment removed to protect patient identity).  These pictures look a little blurred and a clearer picture will make the diagnosis easier. It could be a drug-induced lichenoid reaction or lichen planus probably caused by Losartan. Generally, anti-hypertensive drugs such as this are known to cause lichenoid reactions and lichen planus when medicines are taken for longer periods. Please look for skin lesions also. And visit the dentist, if required the doctors may advise you to go for a biopsy procedure. On clinical examination and with biopsy, it is easier to diagnose and the cause can be determined. If it is drug-induced, the offending drug will be stopped and will be replaced by another one. If the cause is idiopathic (of unknown origin), then it can be managed with a topical corticosteroid cream.  I hope this helps.