Painful callus on feet. I've tried both.

I'm getting these painful callus like thing on my feet(under my little toe, second toe, side of big toe)Everytime the skin begins to harden it hurts then gradually becomes very hard and in sort of like a pointed shape and stops hurting.Skin under my second toe begun to harden almost like three weeks back which hurt at the moment then when it hardened even further it stopped hurting but now the hard skin came off and it's hurting again.The skin under my little toe has stayed hard for around a year now but doesn't hurt and the hard skin has not come off yet,the only problem with that is that it doesn't look good. I had consulted two dermatologists last year and last to last year. One gave me a foot cream first but when it didn't help they also gave me I think some salicylic acid or something which also didn't really help. The second dermat told me that the acid should not have been prescribed and instead told me to change my footwear and gave me a urea based foot cream. I've tried both.