Hello and hope you are doing well.
The rash could be due to contact dermatitis, that is exposure to an irritant like a chemical or metal or anything you are allergic to, it can cause rash. If there is itchiness and watering of the eyes the eye symptoms can be due to an allergen. Allergens include pollen, mold, dust and pet dander. But to exactly pin point the pathology you will need to consult your primary care physician who will examine you an may ask for blood tests. If the need arises he may refer you to a dermatologist.
Hope this helped and do keep us posted.
Allergies, I get similar where is the rash is it raised as in welts, I put mine down to the toxic spraying we are getting in CA .I know UK is also have many chem trails , do some reserach in your area .you may also be allergic to plants, and other toxins in the environment.I wake every day with sore itchy red rimmed eyes, and recently rashes again .