This is an open label, prospective, test of superiority efficacy trial of Ipomea pes-caprae ointment as an add-on therapy in patient with jellyfish dermatitis. Each patient will receive standard medical treatment depend on the severity of the disease. The doctor will divide the dermatitis area of each patient into two parts. Ipomea pes-caprae ointment will be applied as an add-on therapy to the "test area", while the ointment will not be applied to the "control area". Patients will be asked to come for follow up 6 times in the 28-days study period. Primary objective is to compare the healing time of dermatitis in both areas.

The "Test area" and "Control area" are allocated in each participant. We use the Internal Control fashion. The healing time of each area will be collected as an outcome measure.

Inclusion Criteria:

• clinical diagnosis of jellyfish dermatitis
• total lesion area is more than 4 square centimeter

Exclusion Criteria:

• expose to jellyfish more than 7 days
• severe systemic reaction to jellyfish
• allergy to Ipomea pes-caprae or the component of the ointments