SB 3.26.56

nirbibheda virājas tvag-
 roma-śmaśrv-ādayas tataḥ
tata oṣadhayaś cāsan
 śiśnaṁ nirbibhide tataḥ
Synonyms: 
nirbibheda — appeared; virājaḥ — of the universal form; tvak — skin; roma — hair; śmaśru — beard, mustache; ādayaḥ — and so on; tataḥ — then; tataḥ — thereupon; oṣadhayaḥ — the herbs and drugs; ca — and; āsan — appeared; śiśnam — genitals; nirbibhide — appeared; tataḥ — after this.
Translation: 
Then the universal form of the Lord, the virāṭ-puruṣa, manifested His skin, and thereupon the hair, mustache and beard appeared. After this all the herbs and drugs became manifested, and then His genitals also appeared.
Purport: 

The skin is the site of the touch sensation. The demigods who control the production of herbs and medicinal drugs are the deities presiding over the tactile sense.