Under eye circles r physiological in sleep deprivation , stress , past illness convalescence ,less fluid intake or after loose motions or vomiting. It also appears as one of the symptoms of anemia or any chronic illness. So first of all the cause has to be ruled out. As u r having allergic tendancy, it can be the indirect cause of dark circles. For that consult ur doctor first . If it is due to temporary cause then u can try this one : U can put slices of cucumber, cotton eye pads soaked in rosewater, almond oil. Ucan have gentle massage with almond oil at night everyday and wash it in morning .

Its very unfortunate that you struggle to deal, sure in such case Holistic Ayurveda Approach surely will add benefit so plz consult AYURVEDIC Dr nr by in Ur city, Till then 10ml Almond oil (Hamadard Pharma) before bed for 5day with milk. Apply coconut oil at Palm,feet,naval area n on head before bedtime.Hope this is just intro grab advantage