Hi, Thanks for using HCM.
you are feeling may be due to injection or due to any infection (Fungal or healed bacterial like antibioma). But we cant diagnose exactly with description and without proper examination. Since the size has increased and there is color change show it to your doctor once. You may require biopsy
to be done. But need not to worry now.
Hope I answered your question. Feel free to ask me if you have any further queries. Wish you good health. Take care.