Sounds more like your shooting it cold. Try putting the syringe in a glass of hot water for a few minutes. The pat it dry, clean the area well with alcohol, shoot and then the most important part. MASSAGE the area for about 2 to 3 minutes in oder to help move the juice away some. You should feel a whole lot better after doing it this way. (i use sust also and that happened to me a few times also)