Hi,
Noted your history of falling from skateboard,
shoulder injury but then developed pain, bruises and scratches on knee, feeling like it is from inside, making sound sleep difficult.
The most probable causes I can think about are as follows:
While falling there would have been twisting or so in the knee as this occurs commonly but missed as there is no direct hit on the joint of knee.
Hence I would advise you the following in such a situation:
Consult your Primary for preliminary clinical evaluation and get an
MRI of the knee to ascertain the cause.
Once the cause is found like
meniscus tear,
ligament injury then the treatment would be specific.
If the cause is not specific then the following management will help you:
Take rest.
Anti-inflammatory medicine with painkiller properties like
Ibuprofen if it suits you.
Take care.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon