The Compendium of Bheḷa 1.4.19

1.4.19

maṇḍaleṣu tapasphoṭaṃ janayantyarkaraśmibhiḥ | sphoṭeṣv atha tu jāteṣu chāyāyām upaveśayet ||

produce a blister upon the patches through the rays of the sun. / When the blisters have arisen, however, one should seat him in the shade;