I saw the image that you have posted and it looks like a hematoma to me. A hematoma is an internal clot that forms under the skin after trauma. The overlying skin is initially normal in colour, then turns red, magenta, blue and finally pale yellow before going back to its normal tone.
It usually takes quite a strong impact to get such a clot. But do not worry, it is not something life threatening.
In general, I would advise an X-ray of the area to rule out a fracture. But if you are sure that the pain in the area has been subsiding it’s not necessary.
You should try some local measures such as ice packs, support with a crepe bandage and most importantly adequate rest. You may also use topical heparin ointment under your physician’s guidance. If it does not resolve in a week, you should get it examined by a doctor.
Hope that this information helps and hope that you will get better soon.
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Dr. Atul Wankhede