A 44 year old hindu female patient complain of black growth on upper left gums region since 4 months.. No history of any habit.. patient is totally asymptomatic regarding the lesion. no tooth mobility. no displacement of any teeth Probable diagnosis??

26y old male security guard with such pigmentation which started on the back and shoulder slowly descending towards hand sine 1.5y, no symptoms, no history of any allergen contacts, no co morbids DX n Rx please.

A patient with history of black lesion on his lips.. Acc. To him lesion started in upper lip then spread to lower lip.. Since 5 months.. Pt is known asthmatic and is on medication.. Patient works as gold Smith.. Wat it cud be..? lesion is painless..

A asymptotic patient who visited op for another condition. diagnosis?

63 y/o male presented with the chief complaint of a palatal lesion that was of about one month’s duration. The patient stated that about a month prior, he had started to notice roughness in his palate. No pain or numbness, no symptoms related to swallowing or speech difficulty. Examination shows no neck nodes or any other symptoms. Lesion was irregular, was flat in some areas and slightly exophytic in others. The color was not uniform. PMH is significant for rhinoplasty in 1985, malignant melanoma of the skin in 2008 successfully treated with surgery. No history of smoking. Could it be Drug-associated hyperpigmentation or Systemic disease or anything else?