Table 1. Summary of patients' characteristics.

Patient no.	Age (yr)	Disease duration (mo)	Symptoms	Involvement	Color of pigmentation	Pattern of pigmentation	Results of patch test
1	69	36	None	Face and neck	Light brown	Reticulate	Benzyl salicylate(+)
2	55	48	Itching	Face and neck	Light brown	Homogenous	Not performed
3	71	120	None	Face and neck	Light brown	Reticulate	Cobalt chloride(2+), 1, 2-dibromo-2, 4-dicyanobutane(+) As is (2+: shampoo)
4	53	24	Itching	Face and neck	Light brown	Homogenous	Nickel sulfate(2+), cobalt chloride(+)
5	70	18	None	Face and neck	Dark brown	Homogenous	No positive test results
6	61	12	Itching, erythema	Face	Dark brown	Reticulate	Carba mix(+), benzyl salicylate(+)
							2(2-Hydroxy-5-methylphenyl)benzotriazole (Tinuvin P)(2+)
7	46	6	Itching	Face and neck	Dark brown	Homogenous	Balsam of Peru(2+)
8	50	1	Itching, erythema	Face and neck	Dark brown	Reticulate	Not performed
9	81	6	Itching	Face and neck	Dark brown	Homogenous	Not performed
10	47	24	Itching	Face and neck	Dark brown	Homogenous	Potassium dichromate(+), cobalt chloride(+) As is (+: shampoo)