Mrs Plankton is a 44 year old female who has presented today with a painless red eye. She has not noticed any changes to her vision, peri-orbital swelling or discharge from the eye. Mrs Plankton is otherwise well in herself. Her past medical history includes Rheumatoid Arthritis, Gout and Hypertension. She smokes four cigarettes a day and drinks eight units of alcohol and works part-time as a medical secretary. On examination, there is a focal area of erythema (over the upper half of the eye), that disappears on compression and is mobile when pressure is applied with a cotton bud. Visual acuity is 6/10. Mrs Plankton’s observations are all within normal limits and cranial nerve examination is unremarkable.
Given the likely diagnosis what is the most suitable treatment option?