I have a huge birthmark on my back, is there any way to have it removed?

It depends: It depends on its size and location. Removal is possible and is recommended if it will not create too big a gap to fill in with a skin graft. You should consult a dermatologist and a plastic surgeon may be engaged in this discussion. Some of these big birth marks are at risk for change into melanoma so a consultation is recommended now and monitoring it for the long range is advised.