You Do Need power plug adapter while traveling from Lesotho to Aruba.

Here is Why You Need An Adapter

The outlet and plug type used in Aruba are A, B and F and in Lesotho is M. This is how they look like.

Lesotho

In Lesotho, outlets of type M are in use.

Type M

Aruba

In Aruba, outlets of type A, B and F are in use.

Type A

Type B

Type F