instruction: hi doctor I am a 56 year old male on the left knee there is a painless black growth and that has been there for around years now in a recent visit my doctor advised to use lactic acid plus salicylic acid based topical lotion this reduced the size of the growth a little bit however after stopping the lotion for 15 days it grew back to its original size again but it did not become bigger than before I have attached the pictures for your reference could you please advice as what this could be also what treatment would one need for this
output: hi for further doubts consult a dermatologist online