hi welcome to health care magic. im dr satya.
over toes may be due to trauma or friction.
depending on the duration of blister and its cause. since only ibubrufen was given it is likely that it was traumatic.
blue purple line indicates is the margin of the wound and greying of skin is suggestive of surrounding healing.
make sure that there is no much trauma further, and not too much pressure.
leave the wound to air in the night to let it heal soon and apply a light dressing in the morning.
feel free to contact