hi! from the picture you have sent and the brief history u have given,i seems like tick bite to me too. the neurotoxin secreated by the arthropod during the attachment may make the bite unnoticeable. Tick-bite may transmit various organisms during bite which may result in various symptoms like flu-like symptoms,fever, rash, numbness, confusion, weakness etc.Most commonly transmitted disease include Rocky Mountain spotted fever, Lyme disease etc for which appropiate blood tests need to be done and oral and iv antibiotics needed to be started as early as possible.For local symptoms like rash you may use some antibiotic cream after cleansing and for itching we can use some oral antihistamines.