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Dear friend recently you have started strenuous activity. It is very common that with sudden overenthusiastic exercise your muscles get soar. Exercises should be started slowly and to be gradually increased so that muscle, tendons and body vitals get acclimatized for the exertion.
Probably your tendon has got torn off which is showing bruise
, this will heal with time, You also require some analgesic
and inflammatory drug along with some physiotherapy
.Better you rest for a week or so and then gradually you start the workup.
Hope your query is answered.