You seem to be having male pattern alopecia in its initial stages. However if scalp is visible I would surely recommend to start treatment as in hair loss prevention is always better than cure.
Use a ph balanced shampoo and add plenty of fruits and vegetables and protein to your diet. Stop smoking or excessive alcohol intake.
Minoxidil is a medical treatment and you need to be aware of the potential benefits and concentration as well as how best to use it. A dermatologist would be able to guide you on the same. Please remember that these are all medicines and need medical supervision when being used