Hi thanks for your question.
which you got while playing foot ball match is a hematoma
(collection of blood under skin or muscle) the hematoma changes various colour till it disappears,
The downward spread of hematoma is ok, as it will spread dawn due to gravity. However the swelling and itching is matter of concern, which need to be addressed.
The itching and swelling could be due to super added infection, which need to be treated.
You should consult a doctor .you may need a course of antibiotic and analgesic
, anti inflammatory drugs.
Hope I answered your question