A keloid, also known as a crabfoot swelling or keloid tumor, becomes a keloid when the scar tissue grows beyond the incision site to infiltrate the surrounding normal tissue, or when the scar grows beyond the normal growth period. Keloid scars are often supplemented with post-operative radiation therapy. What kind of side effects are possible with post-operative radiation therapy for keloid scars? First, varying degrees of skin color changes, such as skin hypopigmentation or localized erythema of the skin expanding outward, and more rare side effects, such as wound dehiscence or wound infection, which occur at a very low rate.