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katialis contains salicylic acid
,which has a peeling action .Because of this it has caused redness over the leg.You should stop using this cream on leg for scars.The treatment of scars depends upon what type of scars it is ...depressed scar or pigmented one.
If the scar is pigmented then you should apply tretinoin
cream or hydroquinone
cream.If it is depressed then you should go for lasers or fillers.
As far as face is concerned ,it might be different form what it is on leg. Kindly give a detailed description of what you have on face.
Please don't use hydrocortisone
either on face or on the scar.It would be best to consult a dermatologist
for proper treatment.