i think my tats infected

well i got a tattoo about 2weeks ago maybe more. my friend bought a tat gun and had clean needles but the tube wasent new so he soaked it in bleach and boiled it and he gave me two tattoos on my back there small hatchetmen right below my bra well at first it scabbed up and healed well but i started getting little red bumps and i looked at my back because its really sore and i have like 4 or 5 pretty big bumps on my back around the tattoo and they look like pimples but there kindof black in the center. idk if its normal or not because i have very sensative skin and i breakout sometimes on my back but its never been this bad before. please help! im freakedout but i dont wanna go to the doctors unless i find out its not normal.and theres a tiny bump in the leg of the hatchetman