Skin itching round the clock. Problem.

Major ailment/ problem is following: 1- Itching in full body throughout. 2- Around 2-3 times in a day sudden warmth in body and terrible itching in thigh part and below. Burning sensation in full body almost round the clock. Lemon scrubbing used to help but off late in last 2- 3 days no respite. Having sleepless nights for last 30 days. Using coconut oils thoroughly in full body. 3. Dark small black patches in area below knees. 4. Red patches in legs, hands and back area. Image attached. 5. Milder version of this problem was there last year. Things were in control in winters. 5. Taking cobadex vitamin regularly each one day after meal. Zerodol pain killer being taken on and off once in 2-3 days when pain is unbearable in knees due to arthritis. No other medicines other than some homeo medicine are being taken for the problem.