Current medical status: I keep getting intermittently red welts (rash) on my hands (no where else on my body) its very itchty and takes steroid cream to get rid of it.
Current medical treatment: steroid cream and anti-histamine tablets

According to your symptoms (“ getting intermittently red, itching welts (rash) on my hands”) and effective therapy (steroids) you could be experiencing a kind of allergy. If the allergy was provoked by the Merina Coil it should disappear after Merina Coil removal.

You may consult a dermatologist.