Hi there,
I have seen many ankle sprains and without seeing or palpating I assume that the hard lump is soft tissue from the swelling that has hardened which happens after swelling and as a protective response to try and protect the ankle. Spraining your ankle pulls on the ligament and also strains the muscles on the outside of your leg. What this then does it reduces the strength in the muscle so when you go an play again it is too weak and then re injures. After ankle sprains you need to rehabilitate the ankle back to its normal strength. The following points below are my suggestions:
1. Deep tissue release either yourself or by a physiotherapist on the area of pain, what this does is breaks up the soft tissue and increases blood circulation to improve and accelerate healing. ALso releasing the muscles to improve the length and reduce swelling/ pain this can be loacted on the outside of your shin from the outside of your knee down to the ankle. I do highly recommend seeing a physiotherapist for this or for dry needling if they do that in India.
2. Range of movement exercises for the ankle and gentle stretching such as for the calf
Ankle Sprains- Part 2 Stretching and Range of Motion Exercises - YouTube
3. Strengthening exercise such as balancing in on one leg progress to -> calf raises on 2 legs -> calf raises on one leg -> squats ->squats on injured leg maintaining balance -> unstable surface balancing i.e. on a pillow or softer surface -> sport specfic drills i.e. running side ways, hopping, skipping, jumping, pivots and turns. Generally rehabilitation takes over 4-6 weeks before you would be advised to return back to sport otherwise the risk of re injury is high.
I would highly recommend seeing a sports physiotherapist for instruction and advice though otherwise again you are likely to continue to have problems and reinjury.
Hope this helps.