This seems like more of infective. If there was sticking of eyelids then probably it is infective and if its itchy then it can be allergic. Though this is a gross difeerence just to rule out etiology. So if you have any discharge then you might need to start antibiotic else you will be treated on lines of allergic.
Next Steps
seek an ophthalmologist consult
Health Tips
avoid touching other eye or handshakes till diagnosis is clear