Adopted Russian Tortoise

My daughter in law can no longer take care of him so I took him. He has like a sore on his right hind leg, and it looks a bit swollen. I've been keeping it clean with Nolvasan skin and wound cleanser then after I dry him I put Thermazene(silver sulfadiazine)cream on it. I also have a spur thigh tortoise and had some leftover from the vet when his undershell got chipped. I was wondering if you think he will heal up on his own, or should I take him to the vet a.s.a.p.? I will in the near future be taking him for a stool sample to check for parasites anyway. Thank you so much for your time. Sincerely, Vicky Ostrander