My DIY partner and I have been practicing galvanic electrolysis and we’ve gotten good enough that we started on our faces (chin/side burn areas). We’ve been using settings @ 0.5 for 20-30 secs per hair. ALthough the hairs 90% of the time slide out effortlessly, we’ve been noticing sometimes that we get “hardening of the skin”. What I mean by this is that when you pressed gently down on the area of skin it feels hard to touch compared to untreated skin. Is this abnormal? If so what could be the reason for this?