Inclusion Criteria:  Adults (age ≥18 years) identified by their treating clinician as having lower limb cellulitis that requires IV or oral antibiotic treatment either from the hospital or another service based outside of the hospital, which will conduct ongoing follow-up regardless of location.  Exclusion Criteria:  Patients:  who have already received 3 or more calendar days of antibiotics from the hospital for cellulitis. receiving antibiotic therapy for another indication that is anticipated to continue for longer than the antibiotic treatment for cellulitis and that, in the judgement of the investigator, would impact the study assessments. for whom a surgical procedure to treat their cellulitis is planned (i.e. debridement of suspected necrotising skin / soft tissue infection). who, in the judgement of the investigator, do not have a clear diagnosis of cellulitis (to enable the exclusion of infections, such as severe/deep diabetic foot infection, which may be loosely labelled as cellulitis, but treated with different guideline antibiotic agents and durations). lack capacity to give informed consent to participate. are receiving end-of-life care. are already involved in a CTIMP of relevance to the treatment of their cellulitis. are unlikely, in the opinion of the investigator, to comply with study procedures.